Busy photographs contain light and dark areas that can interfere with lettering. The solution should simplify the reading surface without hiding the detail that makes the photograph useful.
Move before adding effects
Try placing the label in a quieter area of the image. A small change in crop can create enough space without a heavy outline. Protect the subject's face, hands, and important product details.
Use a controlled treatment
If placement is not enough, consider a restrained solid panel, local darkening, or an outline that matches the design. Compare the treatment at the final display size. Large shadows and multiple borders can make letters look muddy when reduced.
Check every word
A label crossing both sky and a dark jacket may be readable in one area and disappear in another. Review the whole phrase rather than only its first word. Keep the original photograph unchanged in the project so you can revise the text treatment without rebuilding the image.